Monocrystalline silicon is an infrared optical material with excellent comprehensive cost performance. Optical grade Czochralski silicon (OCZ-Si) as a transmission grade material is widely used in the mid-infrared (3-5um) band, and the infrared transmittance exceeds 50%. Zone-melted monocrystalline silicon can be used in a wider band (1-14um), and high-purity zone-melted monocrystalline silicon (HPFZ-Si) can even be used in the far-infrared band (greater than 30um). The choice of silicon type depends on the wavelength range, component thickness and specific application.
Single crystal silicon is a chemically inert material with high hardness and insoluble in water. It has good light transmission performance in the 1.2-7μm band, and it also has good light transmission in the far infrared band 300-300μm. Performance, which is a feature that other optical and infrared materials do not have. Silicon (Si) single crystals are usually used in the substrate of 3-5μm mid-wave infrared optical windows and optical filters. Because of the material's good thermal conductivity and low density, It is also a common material for making laser mirrors. The density of monocrystalline silicon is 2.316g/cm³, and the Knoop hardness is 1150, which is harder and less fragile than germanium.
|Crystallographic||Growth Method||CZ OR FZ|
|Optical||Refractive Index at n3.0||3.436|
|Refractive Index at n5.0||3.426|
|Thermal Coefficient of Refractive Index at 25 ℃||1.50 x 10-4|
|Transmission Range, microns||1.2 - 10, 50 - 100|
|Thermal Linear Expansion, ℃-1 for 25 ℃||2.55 x 10-6|
|Thermal||Thermal Conductivity, W/(m * ℃) at 27 ℃||159|
|Specific Heat Capacity, J/(kg * ℃)||0.712 x 103|
|Melting Point, ℃||1412|
|Mechanical||Density, g/cm3 at 20 ℃||2.33|
|Young Modulus (E), Pa||1.89 x 1010|
|Shear Modulus (G), Pa||7.99 x 1010|
|Wavelength, Microns||Refractive Index|